[hpsdr] ANAN-100/D HPF/LPF in PowerSDR

[Bill Diaz]

Guys,
     I have been trying to obtain info on how PowerSDR configures the 
Alex HPF/LPF implementation used in the ANAN-100/D.  I have only the 
ANAN-10, so I cannot determine exactly how the ANAN-100/d actually works 
with PowerSDR  The Alex manual is not much help, and I cannot find any 
other relevant information.

     The ANAN-100/D HPF/LPF tab has a bypass check mark on the extreme 
left, adjacent to the HPF filters.  Exactly what does the ByPass check 
mark do?  Does it Bypass both the HPF and LPF on receive, or just the HPF?

     In the bypass column there is a checkmark for 6m BPF/LNA. 
Apparently it disables the 6m BPF/LNA.  Is the full bypass path for both 
HPF and LPF  selected automatically?.

     What does the ByPass/55Mhz HPF do?  Does it use a different HPF 
than the 6m BPF/LNA?  Why would we need a HPF @55 mhz?  Isn't the Hermes 
spec for the receiver something like from 10khz to 55mhz? Isn't there a 
fixed LPF50+ in the hermes receiver?  In addition the Alex schematic 
shows a 55mhz LPF and I can't find a 55mhz HPF anywhere. Does the 
ANAN-100/D PA/Filter board have a similar 55mz LPF on the board?

     I note that the 1.5 MHz HPF bypass is marked 1.5mhz, but the 
default lower HPF filter is marked 1.80000.  Is this correct? If I check 
the ByPass 1.5mhz and tune to 1.799, the Bypass/55 Mhz HPF becomes active.

Thanks in advance for any help,
Bill



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